Yahoo! Pipes!

http://lifehacker.com/software/feeds/geek-to-live–create-your-master-feed-with-yahoo-pipes-235726.php
LifeHacker has a great write-up on Yahoo! Pipes, a great new service that lets you take multiple RSS feeds and integrate, filter, truncate, and do other neat things to create a customized “pipe” or channel. I use it to take multiple RSS feeds and make them into one. Quite Cool Stuff!